BuddyPress
Plugin Review – bbp Style Pack
bbp Style Pack is a huge styling plugin for bbPress and more besides. Using bbp Style Pack you can change the look and feel of just about any element of your bbPress forums, for example you can control the colours and font sizes of all elements of your forums listing page, you can do the same with each individual forum topics list page and you can control the same elements for the individual topic and reply page.